Solution:
Option(C)
To find: Value of 
We have,
Applying 
Applying 
Expanding along 
![\begin{array}{l} \Rightarrow\left[1\left\{\left(a^{2}-1\right)(a-1)-(a-1)(2 a-2)\right\}\right] \\ \Rightarrow[1\{(a-1)(a+1)(a-1)-(a-1) 2(a-1)\}] \\ \Rightarrow\left[\left\{(a+1)(a-1)^{2}-2(a-1)^{2}\right\}\right] \\ \Rightarrow\left[\left\{(a-1)^{2}(a+1-2)\right\}\right] \\ \Rightarrow\left[\left\{(a-1)^{2}(a-1)\right\}\right] \\ \Rightarrow(a-1)^{3} \end{array}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-a4a732e1de5108a8c207f8b1fc423276_l3.png "Rendered by QuickLaTeX.com")
Mark the tick against the correct answer in the following: 
A. 
B. 
C. 
D. none of these
Solution:
Option(C)
To find: Value of
We have,
Applying
Applying
Expanding along
